| 1 | /* |
| 2 | * SPDX-License-Identifier: LGPL-2.1-only |
| 3 | * |
| 4 | * Copyright (C) 2011-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
| 5 | */ |
| 6 | |
| 7 | #ifndef _LIBRINGBUFFER_SMP_H |
| 8 | #define _LIBRINGBUFFER_SMP_H |
| 9 | |
| 10 | #include "getcpu.h" |
| 11 | |
| 12 | /* |
| 13 | * 4kB of per-cpu data available. Enough to hold the control structures, |
| 14 | * but not ring buffers. |
| 15 | */ |
| 16 | #define PER_CPU_MEM_SIZE 4096 |
| 17 | |
| 18 | extern int __num_possible_cpus |
| 19 | __attribute__((visibility("hidden"))); |
| 20 | |
| 21 | extern void _get_num_possible_cpus(void) |
| 22 | __attribute__((visibility("hidden"))); |
| 23 | |
| 24 | static inline |
| 25 | int num_possible_cpus(void) |
| 26 | { |
| 27 | if (!__num_possible_cpus) |
| 28 | _get_num_possible_cpus(); |
| 29 | return __num_possible_cpus; |
| 30 | } |
| 31 | |
| 32 | #define for_each_possible_cpu(cpu) \ |
| 33 | for ((cpu) = 0; (cpu) < num_possible_cpus(); (cpu)++) |
| 34 | |
| 35 | #endif /* _LIBRINGBUFFER_SMP_H */ |